EP0085827A1 - Apparatus for transporting and piling cut iron sheets - Google Patents

Abstract

This device is intended to form ordered stacks on a pallet behind the sheet metal shears, with the aid of a support rake and a stop (4) made of sheet metal sections (6) at a predetermined location. Sheet metal waste that is generated by trimming or at the end of a sheet metal plate is picked up by a separate waste container arranged under the sheet metal feed table and movable under the sheet metal shears. In order to be able to achieve high accelerations and speeds when stacking the sheet metal sections (6), the sheet metal sections for the horizontal movements are gripped and taken along by automatically controlled driver bends (1, 2, 3) arranged on the support rake.

Description

The invention relates to a device for guiding away and stacking of sheet metal sections occurring behind the sheet metal feed table, which have a support rake for receiving sheet metal sections, a stop which can be displaced horizontally relative to the support screen and a height-adjustable roller platform carrying pallets or containers for receiving sheet metal section stacks which, for the stacking of sheet metal sections deposited immediately after the cut on the support rakes, the support rake together with the stop in a first horizontal movement step can optionally be positioned over one of the stacking positions and the support rake in a second rectified movement step for releasing the sheet metal section over the stacking point can be moved out.

With the DE-OS 28 40 668 a sheet metal shears has become known, which on the back of a knife a pile Direction has with which the cut sheet metal strips can be stacked at different locations, in such a way that different stacks ordered, for example, according to sheet metal strip size, or several identical stacks can be operated one after the other in order to make better use of space. The sheared sheet metal strip is placed behind the cutting point on a support grate and pushed onto a chain conveyor by means of push arms reaching between the parallel bars of the support grate. Driving cams which are attached to the chains of the chain conveyor convey the sheet metal strip onto a support rake which can be moved horizontally across the stacking surface and which, from its rest position, is accelerated to the speed of the chain conveyor shortly before the trailing edge of the sheet metal section leaves the chain conveyor. The support rake is pulled back together with the sheet metal section against a stop. To gently brake the metal strip, the stop is accelerated to the speed of the metal strip on the support rake before the leading edge of the metal strip touches the stop and then decelerated to a standstill. Around the transition from acceleration to deceleration, the sheet edge touches the stop and the sheet strip is gently braked to a standstill together with the stop, while the support rake continues to move at a constant speed and the sheet strip falls onto the intended stack. The Fall height is kept almost constant by a vertically adjustable roller platform on which, for example, a pallet for holding the metal strips rests.

A disadvantage of this design is that the stacking device has to work with small accelerations and low speeds so that the sheet metal sections cannot slide on the support rake and can be stacked cleanly. Another disadvantage is the relatively large amount of space required for the stacking device arranged behind the cutting plane with the support grate, the chain conveyor and the support rake. It is also disadvantageous that waste trims fall randomly onto the floor between the cutting plane and support grid when trimming the metal sheets and have to be laboriously removed by hand.

The invention has for its object to propose a stacking device which works perfectly with very high accelerations and speeds, takes up little space and has a collecting device for waste sheets.

This object is achieved by the invention characterized in the claims.

The advantages achieved by the invention can be seen essentially in the fact that the possible large Accelerations and speeds for stacking the sheet metal sections allow electronically controlled guillotine shears to be used optimally, especially since not only the sheet metal blanks intended for further production are stacked, but also the sheet metal waste resulting from trimming the sheet metal sheets and the waste sheets remaining at the end of each sheet metal sheet from a separate one Waste bins are collected. By eliminating the two feeder devices arranged behind the knife, the support grate with the push arms and the chain conveyor, on the one hand the total length of the stacking device is reduced and on the other hand a further time saving is achieved by the shorter distances when stacking the sheet metal sections.

• Fig. 1 einen Schnitt durch den Stützrechen im Bereich eines Mitnehmerbügels, welcher in der Ruhestellung liegt,
• Fig. 2 einen Schnitt durch den Stützrechen im Bereich eines Mitnehmerbügels, welcher in die Arbeitsstellung gehoben ist,
• Fig. 3 einen Längsschnitt durch eine Tafelschere mit angebauter Stapeleinrichtung in Stapelstellung,
• Fig. 4 einen Längsschnitt durch eine Tafelschere mit angebauter Stapeleinrichtung in Abfallschneid_- stellung,
• Fig. 5 die Anordnung eines fahrbaren, auf eine Tragkonstruktion des in Stapelrichtung verschiebbaren Stapelrahmens aufgeschobenen Abfallbehälters,
• Fig. 6 als Variante die Anordnung eines auf der Palette für die Blechstapel aufgelegten, speziell niederen Abfallbehälters und
• Fig. 7 als weitere Variante die Anordnung eines auf die Rollbühne vor der Palette aufgelegten, speziell niederen Abfallbehälters.

Exemplary embodiments of the invention are illustrated in the accompanying drawings, which are explained in more detail below. Show it:

• 1 shows a section through the support rake in the area of a driver bracket, which is in the rest position,
• 2 shows a section through the support rake in the area of a driver bracket, which is raised into the working position,
• 3 shows a longitudinal section through a guillotine shear with attached stacking device in the stacking position,
• 4 shows a longitudinal section through a plate shears with attached stacking means in cutting waste _-. Standing,
• 5 shows the arrangement of a mobile waste container which is pushed onto a supporting structure of the stacking frame which is displaceable in the stacking direction,
• Fig. 6 as a variant, the arrangement of a placed on the pallet for the sheet metal stack, especially low waste container and
• Fig. 7 as a further variant, the arrangement of a specially low waste container placed on the rolling platform in front of the pallet.

In Figures 1 to 7, the same parts are provided with the same numbers. In FIGS. 1 and 2, 1 denotes a driving bracket with 2 its mounting in the support rake 5 and 3 with its U-shaped bend at the knife-side end. A stop is designated 4, a sheet metal section 6 and an actuation curve 7.

In Figures 3 and 4, 9 is a sheet metal feed table denotes on which metal sheets 8 are fed a knife 27 of a knife bar 19 of the guillotine shears for cutting by an electronically controlled and preprogrammable front feed (not shown). A support rake 5 designed to accommodate the sheet metal blanks as a carriage is guided in a left and a right spar 21, 22 which is arranged next to the cutter bar 19 and is moved back and forth by the drive 17. In the same spars 21, 22 a stop 4, which is also designed as a carriage and can be moved independently of the supporting rake by the drive 16 and is intended for the exact positioning of the sheet metal sections, is guided. At the knife-side end of the support rake, the driver brackets 1, 2, 3 shown larger in FIGS. 1 and 2 are arranged. Under the sheet metal feed table, the actuation curve 7 for the actuation of the driving brackets is arranged, as well as a waste container 10 required for receiving the sheet metal waste to keep stacked sheet metal sections 13 always approximately the same size. The rolling platform 11 is built together with the two bars 21, 22 with the stop 4 and the support rake 5 on a common stacking frame 25 and can be pushed back and forth in the longitudinal direction within a limited path by a hydraulic cylinder 18. At the knife-side end of the stack frame 25 is a supporting structure that receives the waste container 28 arranged. The two spars 21, 22 are each connected with a single cylinder and a differential cylinder to the longitudinally displaceable stack frame 25 for the cutting movement so as to be vertically displaceable. For example, a pallet 12 or another stacking device is placed on the roller platform for stacking the sheet metal sections 13. Behind the rolling platform 11 there is a permanently installed parking runway 20 which serves as a transfer station for forklift trucks or as a feeder for a transport device (not shown).

In FIG. 5, 10 denotes the mobile waste container, which is pushed across the guide rails 29 onto the supporting structure 28 transversely to the stacking direction. The pallet 12 with the first sheet stack 13.1 and the remaining sheet stacks 13 is placed on the rolling platform 11. The rolling platform 11 and the supporting structure 28 are carried by the stacking frame 25, which can be moved in the stacking direction, with the rollers 26.

In FIG. 6, 30 denotes the specially lower waste container placed on the pallet 12 instead of the first sheet stack 13.1. The pallet 12 is arranged in the stacking position on the rolling platform 11.

In FIG. 7, 30 denotes the particularly low waste container placed in front of the pallet 12 on the rolling platform 11. The fixed park located behind the rolling platform 11 roller conveyor receives the number 20, the sheet stacks receive the numbers 13.1 and 13.

The stacking device described above works as follows: The metal sheets are fed on the metal feed table 9 by means of an electronically controlled and preprogrammed front feed to the knife 27 of the knife bar 19 for cutting. Before a sheet metal strip intended for production can be cut, in most cases the edges of the sheet metal sheet are trimmed. For this purpose, the guillotine shears are brought into the waste cutting position according to FIG. 4, ie the common stacking frame 25 on which the two spars 21, 22 in which the carriages of the stop 4 and the support rake 5 run, the height-adjustable roller platform 11 and the waste bin 10 receiving support structure 28 are constructed, is pulled back by the hydraulic cylinder 18 by 200 mm. During trimming, the sheet metal section thus falls directly between the sheet metal feed table and the withdrawn stacking device into the waste container 10 pulled under the knife. With the feed movement for the first sheet metal strip, the sliding frame 25 is pushed back into the stacking position according to FIG. 3. When cutting, the knife 27 also lowers the two side rails resting on hydraulic cylinders and with them also the support rake and the stop. For the first stack 13.1 on the knife side, the driver brackets 1, 2, 3 and the associated parts come ge actuation curve 7 not yet used. The cut sheet metal strip is picked up by the support grate between the knife and the positioned stop. The support grid now moves suddenly backwards under the stop and the sheet metal strip, prevented from moving backwards by the stop, falls on the predetermined stacking point on the pallet brought to the correct height on the roller platform. For all of the next stacks, the actuation curve to the carrier brackets is moved beyond the knife in the stacking direction at the same time as the cut, so that the end of the U-shaped carrier bracket protrudes beyond the upper edge of the support rake into the working position according to FIG. 2. The cut sheet metal strip is in turn picked up by the support rake, the sheared edges of the metal strip lying on one side against the stop and on the other side of the driving bracket. During the subsequent horizontal movement, the support rake is accelerated with the metal strip and the stop to a maximum of 7 m / s ² . The sheet metal strip initially glides on the support rake until the sheet metal edge on the back of the catch bracket is in contact. The driver bracket, which has meanwhile moved away from the operating range of the actuation curve, falls down due to its own weight, but remains with the upper bent end of the hook on the edge of the sheet metal strip underneath and takes the sheet metal strip with it. Shortly before the stop reaches the desired stacking point for the sheet metal strip, there is a delay phase in which the support rake and the stop are decelerated in such a way that the metal strip on the support rake executes a relative movement against the stop, the rear edge of the metal strip leaving the upper bent hook end of the driving bracket. The carrier bracket falls due to its own weight all the way down onto the stop in the support rake, into the rest position according to FIG. 1. The stop remains at the predetermined position, while the support rake continues to accelerate its backward movement until it completely withdraws from the area of the stacking point . The sheet metal strip is held back by the stationary stop and falls onto the intended stacking point on the pallet. The roller platform on which the pallet for stacking the sheet metal strips is placed can be adjusted in height by means of four driven spindles and rests in the uppermost position at the start of the cutting work. The increasing stack height is compensated for by the gradual lowering of the rolling platform. This also keeps the drop height for the sheets to be stacked approximately constant. As soon as the pallet is fully loaded and the roller platform has reached the level of the parking runway, it is led away and replaced by a new, empty pallet.

Instead of the embodiment proposed in the example, vertically displaceable driver bolts can also be used, for example, for the carrier brackets mounted with a rotation axis be arranged on the support rake with a cut for taking the sheet metal strips. The driving bolts are also held in two positions, in a rest position assumed by their own weight below the support rake receiving surface and in a working position pushed up by an actuation curve, in which the upper part of the driving bolts with the milling for receiving the rear edge of the sheet metal sections over the upper edge of the support rake protrudes.

Instead of the dead weight of the carrier bracket or the carrier bolt which is used for the movement of the carriers into their rest position, the force of a compression spring or a tension spring could also be used.

Instead of the horizontal backward shift of the common stacking frame by approx. 200 mm required for the waste cutting position according to FIG. 4, controllable guide plates arranged under the knife could be provided, which guide the waste plates, for example when trimming the metal plates, into a waste container inserted transversely under the metal feed table conduct.

Another possibility to circumvent the horizontal backward displacement of the common stacking frame would be through different arrangements of a specially low waste container on the pallet, instead of the first sheet stack according to FIG. 6 or on the rolling platform directly given in front of the pallet according to FIG. 7. However, in the embodiment according to FIG. 6, the larger drop height determined by the height of the waste container when stacking the lower sheet-metal blanks and the less exact stacks that may result would have to be accepted.

Claims (8)

1.Device for guiding away and stacking sheet metal sections occurring behind the sheet metal feed table, which has a supporting rake for receiving sheet metal sections, a stop horizontally adjustable according to the desired sheet section width relative to the supporting rake and a height-adjustable roller platform carrying pallet or sheet section stacks, whereby for the stacking of sheet metal sections deposited on the support rake immediately after the cut, the support rake can be positioned together with the stop in a first horizontal movement step optionally over one of the stacking positions and the support rake can be moved in a second rectified movement step to release the sheet metal section beyond the stacking point is
characterized,
that on the support rake (5), which moves vertically with the knife (27), a driver bracket (1) with a finger (3) is rotatably mounted on the knife side, which, under the action of a arranged under the sheet metal feed table (9), between a rest and an actuating position displaceable actuating curve (7), in the actuating position of which, with the support rake (5) brought up to the sheet metal feed table, is rotated into a driving position in which the finger (3) is above the surface of the support rake (5) protrudes, start acceleration and stop deceleration of the support rake (5) during the execution of the movement steps, the amounts causing the sheet sections (6) to shift on the support rake (5), and a waste container 10, 30 is provided for collecting the waste sheet sections is. 2. Stacking device according to claim 1,
characterized,
that the finger (3) of the driver bracket (1) is U-shaped and has a bent end that is moved under in the driving position from the rear edge of the sheet metal section (6) displaced at the start of the first movement step and released at the stop. 3. Stacking device according to claim 1,
characterized,
that the actuation curve (7) is arranged in its rest position in front of the vertical section plane and in its actuation position it can be displaced behind the section plane in the region of the lowered support rake. 4. Stacking device according to claim 1,
characterized,
that the roller platform (11) built on a common stacking frame (25) carried by rollers (26) Side bars (21, 22) with stop (4) and support rake (5) can be moved horizontally from a stacking position into a waste cutting position within a limited path in the direction of the stacking movement steps. 5. Stacking device according to claim 4,
characterized,
that a supporting structure (28) is arranged on the frame (25), under the knife (27), which holds a waste container (10) which can be inserted transversely to the direction of the stacking movement steps. 6. Stacking device according to one of claims 4 or 5, characterized in that
that between the frame (25) and a fixed parking runway (20) there is arranged a drive unit (18) which moves the frame (25) from the stacking position into the waste cutting position. 7. Stacking device according to claim 1,
characterized,
that the waste container (30) is arranged on the pallet (12) instead of the first sheet stack (13.1). 8. stacking device according to claim 1,
characterized,
that the waste container (30) on the rolling platform (11) is arranged in front of the pallet (12) provided for receiving the sheet metal stack (13), the height of the waste container (30) being approximately the same as the height of the pallet (12).

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